Bump tox from 4.6.3 to 4.6.4 (#85)

Bumps [tox](https://github.com/tox-dev/tox) from 4.6.3 to 4.6.4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/tox-dev/tox/releases">tox's
releases</a>.</em></p>
<blockquote>
<h2>4.6.4</h2>
<h2>What's Changed</h2>
<ul>
<li>Ensure tox r -e docs generates the documentation by <a
href="https://github.com/gaborbernat"><code>@​gaborbernat</code></a> in
<a
href="https://redirect.github.com/tox-dev/tox/pull/3047">tox-dev/tox#3047</a></li>
<li>[pre-commit.ci] pre-commit autoupdate by <a
href="https://github.com/pre-commit-ci"><code>@​pre-commit-ci</code></a>
in <a
href="https://redirect.github.com/tox-dev/tox/pull/3051">tox-dev/tox#3051</a></li>
<li>Bump pypa/gh-action-pypi-publish from 1.8.6 to 1.8.7 by <a
href="https://github.com/dependabot"><code>@​dependabot</code></a> in <a
href="https://redirect.github.com/tox-dev/tox/pull/3052">tox-dev/tox#3052</a></li>
<li>s/setup.cfg/pyproject.toml/ in the development docs by <a
href="https://github.com/sk1p"><code>@​sk1p</code></a> in <a
href="https://redirect.github.com/tox-dev/tox/pull/3058">tox-dev/tox#3058</a></li>
<li>Fix hang and zombie process on interrupt (CTRL-C). by <a
href="https://github.com/sk1p"><code>@​sk1p</code></a> in <a
href="https://redirect.github.com/tox-dev/tox/pull/3057">tox-dev/tox#3057</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/tox-dev/tox/compare/4.6.3...4.6.4">https://github.com/tox-dev/tox/compare/4.6.3...4.6.4</a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/tox-dev/tox/blob/main/docs/changelog.rst">tox's
changelog</a>.</em></p>
<blockquote>
<h2>v4.6.4 (2023-07-06)</h2>
<p>Bugfixes - 4.6.4</p>
<pre><code>- Fix hang and zombie process on interrupt (CTRL-C).
(:issue:`3056`)
</code></pre>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/tox-dev/tox/commit/9fcbf1bad397e8b96225ce4e9d3a1fca19616cb4"><code>9fcbf1b</code></a>
release 4.6.4</li>
<li><a
href="https://github.com/tox-dev/tox/commit/dea2d009147117190e6231a01a1c5132acf6c8f2"><code>dea2d00</code></a>
Fix hang and zombie process on interrupt (CTRL-C). (<a
href="https://redirect.github.com/tox-dev/tox/issues/3057">#3057</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/55c143fe323874b14bbbf843524e6bc7aeabd3b1"><code>55c143f</code></a>
s/setup.cfg/pyproject.toml/ in the development docs (<a
href="https://redirect.github.com/tox-dev/tox/issues/3058">#3058</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/2e31a843ff881a70ceb3a9986dd11be69247a0da"><code>2e31a84</code></a>
Bump pypa/gh-action-pypi-publish from 1.8.6 to 1.8.7</li>
<li><a
href="https://github.com/tox-dev/tox/commit/d7ce800013c18ebc42b2bd8f821c3656da84232d"><code>d7ce800</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/tox-dev/tox/issues/3051">#3051</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/af66165beda328c32952b44eb4798f5c8dbe8567"><code>af66165</code></a>
Ensure tox r -e docs generates the documentation (<a
href="https://redirect.github.com/tox-dev/tox/issues/3047">#3047</a>)</li>
<li>See full diff in <a
href="https://github.com/tox-dev/tox/compare/4.6.3...4.6.4">compare
view</a></li>
</ul>
</details>
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